Hi Jill, thanks for your comments. Working with lustres requires a lot of trial and error, and keeping good records of firing results. I haven't found that firing more than one colour in the kiln affects my work. I do reduce the firing temperatures and soak times depending on the result or colour I want to achieve. Overall I do reduce my firing temperatures for lustres usually by 10 degrees C, of course it depends on how many firings you will do. Most of my lustre work is fired a minimum of 6 to 12 times maximum. So I need to plan and adjust my firings accordingly to control the colour changes.
Also, most of my work uses similar colours during the firings- I like to be economical with my paint ;) so I often paint a few pieces at a time if I know I'm working with the same colour. Perhaps that's why I haven't noticed a big difference of colours affecting the firings.
I hope that helps.

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